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1. 모르는 사실 가정
1. 현재 , 미래 : IF S2 + V2 (현재)
2. 과거 : IF S2 + V2(과거)
3. 희박한 확률 (IF) S2 + should / were to + V2R
2. 알고서 가정
1. 현대사실 반대로 가정 : (IF) S2 + V2 (과거) , S1 + would / could / might + V1R <---동사원형
2. 과거사실 반대로 가정 S1 + would + have pp
Oxygen masks will be released should air pressure fall down.
If i had an umbrella, I could go out
D2. 수일치 : 주어가 3인칭 단수 현재일때, 동사에 단수표시
help -> helps, eat -> eats, go -> goes, have -> has
ex) Few events ( in life ) are as painful as the ~~~~.
either A or B / neither A nor B / not only A but also B / B as well as A ------> B에 수일치
both A and B --> A와 B 둘 다 복수로 쓰기.
2 miles is a long way to run.
the pen which jane uses is mine.
the pen which
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